It's a commonly reported issue, most recently again in the enterprise support, that taking or removing snapshots of large qcow2 files on file-based network storages can take a very long time. Add a note about this limitation.
Signed-off-by: Fiona Ebner <[email protected]> --- pvesm.adoc | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/pvesm.adoc b/pvesm.adoc index d36baf8..165b446 100644 --- a/pvesm.adoc +++ b/pvesm.adoc @@ -88,6 +88,11 @@ block device functionality. ^2^: On file based storages, snapshots are possible with the 'qcow2' format, either using the internal snapshot function, or snapshots as volume chains^4^. +Creating and deleting internal 'qcow2' snapshots will block a running VM and +is not an efficient operation. The performance is particularly bad with network +storages like NFS. On some setups and for large disks (multiple hundred GiB or +TiB sized), these operations may take several minutes, or in extreme cases, even +hours. ^3^: It is possible to use LVM on top of an iSCSI or FC-based storage. That way you get a `shared` LVM storage -- 2.47.3 _______________________________________________ pve-devel mailing list [email protected] https://lists.proxmox.com/cgi-bin/mailman/listinfo/pve-devel
